A criterion to improve the efficiency of universal motors used in vacuum cleaners is presented; the lamination external sizes and the stack length are maintained unvaried. A mathematical model of the motor is derived, that provides the expressions of torque, current THD, Joule and core losses as a function of the magneto-motive forces and the pole flux. The model is validated by tests and the energy and cost savings related to winding data changing are evaluated. Then, a new lamination internal geometry is studied, that de-saturates rotor teeth, yokes and pole tips, thus increasing the performances.
Efficiency Improvement of Universal Motors Used in Domestic Appliances
DI GERLANDO, ANTONINO;PERINI, ROBERTO
2004-01-01
Abstract
A criterion to improve the efficiency of universal motors used in vacuum cleaners is presented; the lamination external sizes and the stack length are maintained unvaried. A mathematical model of the motor is derived, that provides the expressions of torque, current THD, Joule and core losses as a function of the magneto-motive forces and the pole flux. The model is validated by tests and the energy and cost savings related to winding data changing are evaluated. Then, a new lamination internal geometry is studied, that de-saturates rotor teeth, yokes and pole tips, thus increasing the performances.File in questo prodotto:
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